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POLinux C Socket:"bad file descriptor" occurs when accept() invokes
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Id
11416396
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11416773
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1
ClosedDate
CommentCount
7
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CreationDate
2012-07-10T15:11:04.757
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1
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2012-07-11T10:45:27.887
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2012-07-10T15:27:33.260
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1221244
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1221244
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5922
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text
Body
<p>I am writing a send/receive project using linux/socket/tcp, I create some threads to send or recieve message,and use a global queue to store message Code:</p> <pre><code>void EnQueue (M_queue queue,char * message,char * target_IP,char * target_IP_BAK) { char a; char * m=&a; strcpy(m,target_IP); M_element node=(M_element)malloc(sizeof(struct MessageNode )); node->message=message; node->target_IP=target_IP; node->next=NULL; if(IsQueueEmpty(queue)) { queue->rear=queue->front=node; } else { queue->rear->next=node; queue->rear=node; } } M_queue messages; void* receive_message(); void* send_message(void* args); int main() { pthread_t in_thread,out_thread; messages=(M_queue)malloc(sizeof(struct MessageQueue)); init(messages); int ret=pthread_create(&in_thread,NULL,receive_message,NULL); if(ret==-1) { perror("thread receive:"); } while(1) { if(!IsQueueEmpty(messages)) { M_element message=DeQueue(messages); pthread_create(&out_thread,NULL,send_message,(void*)message); } } pthread_join(in_thread,NULL); return 0; } void* send_message(void * args) { struct sockaddr_in sockaddr_out; M_element message=(M_element)args; int cfd=socket(AF_INET,SOCK_STREAM,0); if(cfd==-1) { perror("send_socket"); exit(1); } sockaddr_out.sin_family=AF_INET; sockaddr_out.sin_port=htons(9734); printf("%s\n",message->target_IP); sockaddr_out.sin_addr.s_addr=inet_addr(message->target_IP); int ret=connect(cfd,(struct sockaddr *)&sockaddr_out,sizeof(sockaddr_out)); if(ret==-1) { perror("connect"); offline_message(message->target_IP,message->message); exit(1); } if(write(cfd,message->message,strlen(message->message)+1)==-1) { perror("write"); exit(1); } close(cfd); } void* receive_message() { char buf[256]; char IP[256]; memset(IP,0,256); int first_socket=socket(AF_INET,SOCK_STREAM,0); if(first_socket==-1) { perror("socket"); exit(1); } struct sockaddr_in in_socketaddr; in_socketaddr.sin_family=AF_INET; in_socketaddr.sin_port=htons(9999); in_socketaddr.sin_addr.s_addr=INADDR_ANY; int ret=bind(first_socket,(struct sockaddr *)&in_socketaddr,sizeof(in_socketaddr)); if (ret==-1) { perror("bind"); exit(1); } ret=listen(first_socket,10); if(ret==-1) { perror("listen"); exit(1); } int accept_socket; while(1) { **//error occurs** **accept_socket=accept(first_socket,NULL,NULL);** printf("%d!",first_socket); if(accept_socket==-1) { perror("accept"); exit(1); } int ret=read(accept_socket,buf,sizeof(buf)); close(accept_socket); if(ret==-1) { perror("read1"); exit(1); } findIP(buf,IP); **EnQueue(messages,buf,IP,IP);** printf("%d!",first_socket); } close(first_socket); } </code></pre> <p>I send message "test" to the appliaction , accecpt() works well but I send message "test111111" ,"bad file descriptor" occurs when accept() invokes; and I find the 'first_socket' changes when EnQueue() invokes,but i cant find a solution ..anyone can help me ,THX</p>
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<c><linux><sockets>
Title
Linux C Socket:"bad file descriptor" occurs when accept() invokes
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